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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdaaf2c02dd2e9269c1ee7837ea1028ea287c4b8105735fe4017144a856aa8de' 
  AND token = 'IvuZqX/hXaFb75ZXsyp+iPmGG8iA1ioM78phoW5lbUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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