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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447cd4c65c77b078b37b223c61ab000e8cf2ab7812567fbc858d4b2b5d6047b5' 
  AND token = 'Bi89L5ucBKGhVJ5ry87H23kB/cEaL24StMk9JJh7MOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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