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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84263f47f0f0f6a3c45950a3c1b841ca3b3062ac3e45f9e79405fc2fd2c202f' 
  AND token = 'HvY/BZut4n5RzkbzZP0FnN6Ji5ttHsmcuhG6SPy0ldI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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