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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4057e554877f3e05a40b3da4314078347f31760209c8aff69afb7ea419fe23ed' 
  AND token = 'lUJxqhBGNawCwYl5IGQaL+MNBP4b81Mya5E9Ogngg/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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