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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c953f645158d76821ee9dd0acc5fd1d3c7b2926775bdf18762d7e093dd4081' 
  AND token = '/SD8yb6vM7unrH9zPbZiDLreyqGbdlZMkhSs1AYfxYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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