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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba032c46446e8839874d90f96071c96c969b29fd67a8bde1e5aeccac6e4a209e' 
  AND token = '8+2TKsQgf+ZyaOiBjXmF/Jb4LgJFf/i/y4MoVsZ/tkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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