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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232170f67d842eb7cf0ea95c01892d87c6525a34204b0c278df21cbd55dba215' 
  AND token = 'LHL1JZK9eZTJSsIS9ProCvt+bpR2KWV6tpejVSdJfkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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