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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c0899c11002daff8f360f32fe31ba768ce96cfa1845c9290c15fca7cbcb3b7' 
  AND token = 'vH+l0JSRjD6Y8im2fUVHoilJm7uPzvwNidE8VrEYyB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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