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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3d9d442a4f6ced19dac48a97a568238e491afcee6bfcef86d52860f7955227' 
  AND token = '0zC2hmTDj7aAHjEVPtsQVaCU0LIST64fkWV4Im7c+90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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