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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa8f06b885dc5bbbc2e43381659e30ecec69b7a5a34aa53cef929c61068aa3a' 
  AND token = 'wvadbXRlePUN0pmXXuZU0eFl/tesfR5skzyVirWIyyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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