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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0761324d4c765b8407f5c09c69985b2bd3a88fee97f89f4f176a274c65aef1' 
  AND token = 'FBBpSiyE9YoNfmRB7l4r1USnmGPfMFeLAKXEFBhGljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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