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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcc063f005122023acd135c1f8600bc4c880d576de32cc8674d4f7af5b564b0' 
  AND token = '4/glxSMZsVt+0HaPRRxh/AGKfhJJsQP8K5pMADNZd68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}