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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afc68f4b049555f8733bd1d416152fa74fb934d4d5a23414b9c7466d91fe6e2' 
  AND token = 'Icx1suWXFXkrSggTTlfYI+RdvW44kCvCXCA2DdTtQB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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