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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf07bd87ac8552cde3aca0a94fb7fd698a790e6e1ed1712301c0838b4df04222' 
  AND token = 'Pg7R0BQFLP2XJuTwYf+tIEnxWqgnoSHL0ZTmK5LEKOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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