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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7264a1e88811ff7b6ced08f70f716b2ebac46348780be0e2879aed264eef08' 
  AND token = 'oD6jYomqF2GwmBRpmqi1t3x4v4AEQEqj0mjI7YixWDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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