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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28406025d402293ab5c4b129429ae6ed0ef1d70b6fb4c8c0fac8303948214fc4' 
  AND token = '4AfKnFZ+S7ywoeULLOhk5U+flxhV+y9Ny68aQpAogrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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