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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318b946a948b12db525fd669309ecc2f77b7380ba944025038d428309229e121' 
  AND token = 'i8YCGE6ecySKSXnQPjkXZrMjhY2a1MXdobb6Zp4tR3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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