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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898be562742f02f89f9eab274a959e431ad91ca8cc314c54cf0f7cac705cebc8' 
  AND token = 'T3eg+Psi+HkvC2J/x6orZ+c/LytJuH3QM9tamOKsBSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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