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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32ffe3dec36b3d3ff71bd867bb0310b2022d8e82c91f63622ea2324687fa670' 
  AND token = '7pbTc7/nimD1YtYKKQIWNhAOS2JDHOTW7Il6x86sKhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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