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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64f5d5ea1f04f3ea05f786cc2f063165f968710e62d3360608589e595a760fb1' 
  AND token = 'oGDK+ffogjyiPdkak8TOrznO9RgerH8BE7ZrVqGQh2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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