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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5651163315235e264b64389b5b495b14553e3cd1fccd8c42993d1547cb40d71d' 
  AND token = 'Mu3PEWrqF4ND2zOI9GEJnuaX4ty9YqyD1E4/K7FtWlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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