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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651eb22cb64b42d8e3ada17189f70f008c3a84fa07313e44f37dc6c6c742580c' 
  AND token = '5cPn22O4U876zO6cKvSJ0kh005WX7j4VqsZPxQl28nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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