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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be267cda875fa5512c3fab8a85b8d8e918f0fda985c8f08e17ca9025f94f8fd' 
  AND token = 'Uftf46XSL7xNGMal8QHqhoiEyhu7YZkTDLaqik97NpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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