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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115d4fcdf87d83e6cd0d0f45cb8eed7ebfeb31278661069afed5be0a4c637893' 
  AND token = 'u2bDLEyWjrXG8rOUKOjf6oR38ol+lErR3iquHE9Bsl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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