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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add3a3c168669092ff63b7e0b36df96877424d9af342bb796132d31d56455bc1' 
  AND token = 'Tp3JB2sy97Snf1XcK2z78ym1cuxqR2jbps9QDhrsTdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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