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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f097172d6dc1d5ad366feb2d9eb408e28547e77f5d4b5d4875b41e0c15d40fc1' 
  AND token = 'xq6aHKGDl4uFC9zaJLQI7MuwydBEy7aHoL6jRJsOCAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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