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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93c62c2267bb771e5fdbcc1cbd48eecfa98b583593e14397de8b74a5ed1f84a' 
  AND token = 'Vg/YL/SNgGA6PTjFXlQE1gdOue2KUbRDrfQmOPmtF4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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