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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe83917a45a7ded1841e7045b5f25da410b4a56c38c187b01ddc18b189690cdd' 
  AND token = 'kUGuOULazZnoaMYhSpYU4GY9CRWYavkKtSUsH5yIwRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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