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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfca3aebe6ed3f8b0405fbb91e869833db0b01adb067a526e276bdc880a96244' 
  AND token = '0DlooU9G8S8PrgaqX11T8Ek7Vh8xttmKKnaY4oxg+0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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