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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc31658bccdad8fadb518c36ee1ea2f3a0fed75fcd9474f40f3de89650ca76c8' 
  AND token = '7Xv/qdZzJfMrdIL08pnzHt8EMk+v32rpQwgxy/RdpQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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