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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d4fa778ebc7d6eb025e625a14c975068f35a5f34091f9efd5d5e371e60561d' 
  AND token = '2rhEpEetA32MGeO5SbUGbb2IVDdAe9o6vqIKWXpPOig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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