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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6fb1897db2dbb45be0b6c357e766c9c51f453c2eb230a3d0294e017693001f' 
  AND token = 'ifgIK6U/Lj3E0PCJ/qReSC1ax+CCEe2L70kh2/5UwL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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