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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6e53d95cdd8c525d443137dce2955711c1660912056c03bc81c56c5229c546' 
  AND token = 'mRYPAqtGv/TX7+V8mgDO67c49lI+ZJ1m2syjD0HuQcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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