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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '841074b69e4e73e3b0f2d516fee5b23e4778502d00cf0ec93011e8e4a5e892a4' 
  AND token = 'zvbrbgb7FrltYDI0/oYquv215NBPZVqq0H2soEHsWNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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