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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b51acc3d1f2e0d6ef0d1186a6cadd76195e4ac4903a9ff193f4fb63c97928e8' 
  AND token = '6VhzVlR3QAJr28pq6WygdMHrle5yAA6o2X1EkVzleYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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