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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a136d24c76dcdecd470ff5cd219f5fb2e0a36b7aaf1257e7a2ab0857edc547c3' 
  AND token = '0laJYVv0FACbMZTyz5a6epveF1yvuhxIyPciV52PCBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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