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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4358c0b3dbb78e3856d90df9a4e51c2f9a50589adfe917b746245329d7a29a' 
  AND token = '7y+Yl763kGqZ2ak5/8T06glUZEdBzbplNzD1KtE62DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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