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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c72702322da0710a2ae946d6c7424f6cdb6aad6c7c36e3cf654b5fcdd72508' 
  AND token = '34NQ7GRgIzIexZrIdn2wjL4qv9CV0wJu8MSsbscM7y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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