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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea093572dd0905397868a3f9836978f561fa6c43a4591aabe1037d07f405ce65' 
  AND token = 'NpbrfSx5APyw1iNlSyBVduPlGLTyxmMZWAO16+Lf6+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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