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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbf2cb5229bfe7b034318fd51841c0cfb7392bc3d2f3dab65fdc8357ed10618' 
  AND token = 'Vf6RET/yUpm2MedcxrdJoBvcHq+erjpIF+0GpthiIu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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