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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6156324871eeb1ea0b1d2bf966b963045afb08749e6d2bb0533d56df4cafe0d9' 
  AND token = '7eJgEuxssk4A2V2SwoMAuPf8KmmlZoLkSGupAxb5IVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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