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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00d7452e8e7077402d0b5bafe55201d8579f8320aec3f9e10fec80db819f461c' 
  AND token = '+iY+2hPQn5LeK3Y+D3mv2PDis06mhY2wdAvPteQI5A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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