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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd559531a8ed6cd629eab945f365285e67d755785573a379df32f54e65c8b0257' 
  AND token = 'o5G17Vk08kcv2YrRwTIedsnwALS+KuI3lSQOnyN/w+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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