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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcadc272169f48a4544a689d3d42c16ac0c064b8bd4702f183d24071bf0ec436' 
  AND token = 'ZLLtl1OiWfTm3p2P1Qe8ZdnU37MfurWj3Kxrq2D77wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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