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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8705d527e47fd502d046dd3ca3a4f3e1ac6512abbce927c0fd0556b78040c1a3' 
  AND token = 'lVSq/sHmjHfEXt9W+eFMiNg755+5pvyEZ4jfsFES/KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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