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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcc24b2e2429cca1f528651d278507847637ef6310cc5dfe2ae4508b9bf2ab7' 
  AND token = '387m2PEsIBvJWoL1golm9dlJMSFKR6eHtPl9e5oD1Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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