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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc94f61774f3eeba83b842ecdc4ef6b8ec641de85198ad3a1d7d42bcefee468' 
  AND token = 'toyCIrKAWef3IgZacPZPJ477dYzxFhNmusYS6fom9LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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