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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd038628ebb1dcb291d4c2f6b603299fbf1ce43d28e3d1fe63977cdb8148d3f' 
  AND token = 'EXbixmkdFeumFekgdNWg7WQ6/wwG1XsyJCbS4WQCCLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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