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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ed43658dfaabf3d1347e008b9072660c8784a4dda536a95eda989e370f17b0' 
  AND token = 'EhhiNFahhwWnIvPmevCXIvO+nDHfiawSqKPv/Oilv0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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