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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5752f1588fd1c67766db8a0e86740cdbdbf6d15f783141a04be085a4d21396d9' 
  AND token = 'PHbWqU4ejt88E5co8fz96dRS3lmNFJLYxODkeBOIuTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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