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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64dab1a79fb2eecc2eadd9f20ad3d20a802fa96dd6a5c646072adb9012b99b86' 
  AND token = 'J7qZikOWePL8UIzca7dhptQbVd3NUa7IogGrn1cFS0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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