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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db35f4d804408cce44cccdd4f33b585401e622132dbc57d5c0cb0f9bc5001e6a' 
  AND token = 'IfD9YKiF0SBepUoYZmKOIi8Pt5ssIVUX0sfY3xf7+3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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