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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442e037c0e9306f47974a3e3d9ac245ba9b3a3136677a8d00d60cb9276f9f7df' 
  AND token = 'expiKv8SA9CF7MI2vBxJj7SU9u7dbDF3oQYylh2xl7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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