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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2060b5ffc7e107e80deb349f79848fcdc957f7413ba666eab121cc16372c18' 
  AND token = 'AeJNaUAufJBByOI98Mf7JdwlGGmp9GOGH9F2UxttE9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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