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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ae28130104be24c1444d90c2a222a73298c51329769dd2d5c5ec1920497cea' 
  AND token = '1zTDhT1FIOi0Gkg/bgrY0X/lshVT4nkeEgt2DChiGrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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