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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534abe44620ec712bf4beb3382ca34246efc6811e272373eaa8d928c44b3c250' 
  AND token = 'ipmzbiAceG9FX9yOWexdRdivcBXmv+FDod9e2Bf2avU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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