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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93d37d45bcf29f7bf550fda6691ac6b87d790e419a4cf1630e4b8c2990ad015' 
  AND token = 'C0iKoiYhkucNC8nlFR6gs58sdWc/aD6+fHGmZ9nUJRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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