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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13793aa58b0827d23f2d6ed3b34cbbe19358701c626824962257baa203e79986' 
  AND token = 'vsWhC6oICTH10fnwO3UrrsQx5yRAdCYsFe5D2bPiHAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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