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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b88c00218b283a9a2b45afa49e78a85177fb13715fd3e16123836451aa2d81' 
  AND token = 'AYnAVGS1IilZlnbEYJDaFz1xa7H43pLr2x3bMwB8l/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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