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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec13c12ab9e1571730ebf118c0a9401b41132c868f6ca0b0b0c353bffb23da07' 
  AND token = 'FnWxj3Ef8fLJ0O7R9XBa4myeir8yPI8DguJhkM29aME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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